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1 19-186; Rev 1; 3/1 5mA Low-Dropout General Description The low-dropout linear regulator operates from a +2.5V to +5.5V supply and delivers a guaranteed 5mA load current with low 12mV dropout. The high-accuracy (±1%) output voltage is preset at an internally trimmed voltage (see Selector Guide) or can be adjusted from 1.25V to 5.V with an external resistive divider. An internal PMOS pass transistor allows the low 125µA supply current to remain independent of load, making this device ideal for portable battery-operated equipment such as personal digital assistants (PDAs), cellular phones, cordless phones, base stations, and notebook computers. Other features include an active-low open-drain reset output that indicates when the output is out of regulation, a.1µa shutdown, short-circuit protection, and thermal shutdown protection. The device is available in a miniature 8mW 6-pin SOT23 package. Notebook Computers Cellular and Cordless Telephones Personal Digital Assistants (PDAs) Palmtop Computers Base Stations USB Hubs Docking Stations Applications Pin Configuration Features Guaranteed 5mA Output Current Low 12mV Dropout at 5mA ±1% Output Voltage Accuracy Preset at 1.5V, 1.8V, 2.V, 2.5V, 3.3V, 5V Adjustable from 1.25V to 5.V Power OK Output Low 125µA Ground Current.1µA Shutdown Current Thermal Overload Protection Output Current Limit Tiny 8mW 6-Pin SOT23 Package Ordering Information PART* TEMP RANGE PIN-PACKAGE EUAT -4 C to +85 C 6 SOT23-6 *Insert the desired two-digit suffix (see Selector Guide) into the blanks to complete the part number. Note: The requires a special solder temperature profile described in the Absolute Maximum Ratings section. PART AND SUFFIX Selector Guide SOT23 TOP MARK EUT15 1.5V or Adj AASO EUT18 1.8V or Adj AANU EUT2 2.V or Adj AANV EUT25 2.5V or Adj AANF EUT33 3.3V or Adj AANG EUT5 5.V or Adj AANH Typical Operating Circuit TOP VIEW V IN = 2.5V TO 5.5V IN NC OUT IN 1 6 OUT C IN 1µF C OUT 3.3µF POK SHDN 2 5 SET 3 4 GND ON OFF SHDN POK R POK 1k TO µc SOT23 SET GND Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at
2 5mA Low-Dropout ABSOLUTE MAXIMUM RATINGS IN, SHDN, POK, SET to GND...-.3V to +6V OUT to GND...-.3V to (V IN +.3V) Output Short-Circuit Duration...1min Continuous Power Dissipation (T A = +7 C) (Note 1) 6-Pin SOT23 (derate 1mW/ C above +7 C)...8mW Operating Temperature Range...-4 C to +85 C Junction Temperature C Storage Temperature Range C to +15 C Lead Temperature (soldering, 1s) (Note 2)...+3 C Note 1: Thermal properties are specified with product mounted on PC board with one square-inch of copper area and still air. With minimal copper, the SOT23 package dissipates 712mW at +7 C. With a quarter square inch of copper, it will dissipate 79mW at +7 C. Copper should be equally shared between the IN, OUT, and GND pins. Note 2: This device is constructed using a unique set of packaging techniques that imposes a limit on the thermal profile to which the device can be exposed during board-level solder attach and rework. The limit permits only the use of the solder profiles recommended in the industry standard specification, IPC JEDEC-J-STD-2A, paragraph 7.6, Table 3 for the IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V IN = + 5mV or V IN = +2.5V, whichever is greater; SHDN = IN, T A = -4 C to +85 C, unless otherwise noted. Typical values are at T A = +25 C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Voltage V IN V Input Undervoltage Lock-Out V UVLO Rising, 75mV hysteresis V Output Voltage Accuracy (Preset Mode) Adjustable Output Voltage Range SET Voltage Threshold (Adjustable Mode) Guaranteed Output Current (RMS) V SET I OUT = 1mA, T A = +25 C, 2.V I OUT = 1mA, < 2.V I OUT = 1mA, T A = -4 C to +85 C I OUT = 1mA to 5mA, V IN > +.5V, T A = -4 C to +85 C % V V IN = 2.7V, T A = C to +85 C I OUT = 1mA, set to 2.V T A = -4 C to +85 C I OUT V IN 2.7V 5 ma Short-Circuit Current Limit I LIM =, V IN 2.7V A In-Regulation Current Limit > 96% of nominal value, V IN 2.7V 1.6 A SET Dual Mode Threshold mv SET Input Bias Current I SET V SET = 1.25V na I OUT = 1µA Ground-Pin Current I Q I OUT = 5mA 14 Dropout Voltage (Note 4) V IN - I OUT = 5mA Line Regulation V LNR V IN from ( + 1mV) to 5.5V, I LOAD = 5mA Dual Mode is a trademark of Maxim Integrated Products = 5V 1 22 = 3.3V = 2.5V V µa mv %/V
3 5mA Low-Dropout ELECTRICAL CHARACTERISTICS (continued) (V IN = + 5mV or V IN = +2.5V, whichever is greater; SHDN = IN, T A = -4 C to +85 C, unless otherwise noted. Typical values are at T A = +25 C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Load Regulation V LDR I OUT = 1mA to 5mA.4 1. % Output Voltage Noise 1Hz to 1MHz, C OUT = 3.3µF (ESR <.1Ω) 115 µv RMS SHUTDOWN Shutdown Supply Current I OFF SHDN = GND, V IN = 5.5V.1 15 µa SHDN Input Threshold SHDN Input Bias Current POK OUTPUT V IH 2.5V < V IN < 5.5V 1.6 V IL 2.5V < V IN < 5.5V.6 I SHDN SHDN = IN or GND, T A = +25 C 1 25 T A = +85 C 5 POK Output Low Voltage V OL POK sinking 1mA.1.1 V Operating Voltage Range for Valid POK POK sinking 1µA V POK Output High Leakage POK = 5.5V, T A = +25 C 1 25 Current T A = +85 C 5 POK Threshold Rising edge, referred to (NOMINAL) % THERMAL PROTECTION Thermal Shutdown Temperature T SHDN 17 C Thermal Shutdown Hysteresis T SHDN 2 C Note 3: All devices are 1% production tested at T A = +25 C. Limits over the operating temperature range are guaranteed by design. Note 4: The Dropout Voltage is defined as V IN -, when is 1mV below the value of measured for V IN = (NOM) + 5mV. Since the minimum input voltage is 2.5V, this specification is only meaningful when (NOM) > 2.5V. For (NOM) between 2.5V and 3.5V, use the following equations: Typical Dropout = -93mV/V (NOM) + 445mV; Guaranteed Maximum Dropout = -137mV/V (NOM) +74mV. For (NOM) > 3.5V, Typical Dropout = 12mV; Maximum Dropout = 22mV. Typical Operating Characteristics (V IN = ( + 5mV) or +2.5V, whichever is greater; SHDN = IN, C IN = 1µF, C OUT = 3.3µF, T A = +25 C, unless otherwise noted.) V na na GROUND PIN CURRENT (µa) I LOAD = 15mA 1.8PUT GROUND PIN CURRENT vs. INPUT VOLTAGE 3.3PUT 2.5PUT toc1 GROUND PIN CURRENT (µa) GROUND PIN CURRENT vs. LOAD CURRENT 1.8PUT 3.3PUT 2.5PUT toc2 GROUND PIN CURRENT (µa) I LOAD = 15mA GROUND PIN CURRENT vs. TEMPERATURE 5.PUT 1.5PUT toc INPUT VOLTAGE (V) LOAD CURRENT (A) TEMPERATURE ( C) 3
4 5mA Low-Dropout Typical Operating Characteristics (continued) (V IN = ( + 5mV) or +2.5V, whichever is greater; SHDN = IN, C IN = 1µF, C OUT = 3.3µF, T A = +25 C, unless otherwise noted.) DROPOUT VOLTAGE (mv) = 3.3V DROPOUT VOLTAGE vs. LOAD CURRENT T A = +25 C LOAD CURRENT (A) T A = +85 C T A = -4 C toc4 OUTPUT VOLTAGE ACCURACY (%) OUTPUT VOLTAGE ACCURACY vs. LOAD CURRENT 3.3PUT LOAD CURRENT (A) 2.5PUT 1.8PUT toc5 OUTPUT VOLTAGE ACCURACY (%) OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE = 1.5V TO 5.V TEMPERATURE ( C) I LOAD = 15mA toc6 PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY C OUT = 3.3µF = 3.3V R LOAD = 1Ω toc7 V IN LINE TRANSIENT toc8 2.5V 1mV/div 3.5V 5mV/div I OUT LOAD-TRANSIENT RESPONSE toc9 V IN = 3.3V = 2.5V 5mA 1mA 2mV/div µs/div 4µs/div FREQUENCY (khz) LOAD-TRANSIENT RESPONSE NEAR DROPOUT toc1 POWER-ON RESET toc11 V IN = + 1mV = 3.3V VOUT 1mV/div V POK 2V/div 2mA IOUT V IN 1µs/div 1ms/div 4
5 5mA Low-Dropout Typical Operating Characteristics (continued) (V IN = ( + 5mV) or +2.5V, whichever is greater; SHDN = IN, C IN = 1µF, C OUT = 3.3µF, T A = +25 C, unless otherwise noted.) SHUTDOWN VOLTAGE POK SHUTDOWN WAVEFORM toc12 2µs/div 2V/div SHORT-CIRCUIT CURRENT LIMIT (A) SHORT-CIRCUIT CURRENT LIMIT vs. SUPPLY VOLTAGE (NOM) = +2V SUPPLY VOLTAGE (V) toc13 Pin Description PIN NAME FUNCTION 1 IN 2 POK 3 SHDN Regulator Input. Supply voltage can range from 2.5V to 5.5V. Bypass with a 1µF capacitor to GND (see Capacitor Selection and Regulator Stability). Open-Drain POK Output. POK remains low while the output voltage ( ) is below the POK threshold. Connect a 1kΩ pull-up resistor from POK to OUT to obtain an output voltage. Active-Low Shutdown Input. A logic low reduces supply current below 15µA. In shutdown, the POK output is low, and OUT is high impedance. Connect to IN for normal operation. 4 GND Ground 5 SET 6 OUT Voltage-Setting Input. Connect to GND for preset output. Connect to a resistive voltage-divider between OUT and GND to set the output voltage between 1.25V and 5.V. Regulator Output. Sources up to 5mA. Bypass with a 3.3µF low-esr capacitor to GND. Use a 4.7µF capacitor for output voltages below 2V. Detailed Description The is a low-dropout, low-quiescent-current linear regulator designed primarily for battery-powered applications. The device supplies loads up to 5mA and is available with preset output voltages. As illustrated in Figure 1, the consists of a 1.25V reference, error amplifier, P-channel pass transistor, and internal feedback voltage-divider. The 1.25V reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output and increases the output voltage. If the feedback voltage is too high, the passtransistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through either an internal resistive divider connected to OUT or an external resistor network connected to SET. The Dual Mode comparator examines V SET and selects the feedback path. If V SET is below 5mV, the internal feedback path is used and the output is regulated to the factory-preset voltage. 5
6 5mA Low-Dropout V IN = 2.5V TO 5.5V C IN 1µF ON OFF IN SHDN SHUTDOWN LOGIC MOSFET DRIVER WITH ILIM V REF 1.25V THERMAL SENSOR 5k OUT = 1.25V TO 5.V C OUT 3.3µF LOGIC SUPPLY VOLTAGE ( ) ERROR AMPLIFIER R1 R POK 1k TO µc POK SET 93% V REF 1mV GND R2 Figure 1. Functional Diagram Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Internal P-Channel Pass Transistor The features a.25ω P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The does not suffer from these problems and consumes only 125µA of quiescent current under heavy loads as well as in dropout. Output Voltage Selection The s Dual Mode operation allows operation in either a preset voltage mode or an adjustable mode. Connect SET to GND to select the preset output voltage. The two-digit part number suffix identifies the output voltage (see Selector Guide). For example, the EUT33 has a preset 3.3V output voltage. The output voltage may also be adjusted by connecting a voltage-divider from OUT to SET to GND (Figure 2). Select R2 in the 25kΩ to 1kΩ range. Calculate R1 with the following equation: R1 = R2 [( / V SET ) 1] where V SET = 1.25V, and may range from 1.25V to 5.V. Shutdown Pull SHDN low to enter shutdown. During shutdown, the output is disconnected from the input and supply current drops to.1µa. When in shutdown, POK pulls low and OUT is high impedance. The capacitance and load at OUT determine the rate at which decays. SHDN can be pulled as high as 6V, regardless of the input and output voltage. 6
7 5mA Low-Dropout V IN = 2.5V TO 5.5V ON OFF C IN 1µF IN OUT SHDN SET POK GND R1 = R V C OUT 3.3µF R 1 R 2 MAXIMUM OUTPUT CURRENT (ma) MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE (POWER DISSIPATION LIMIT) MAXIMUM RECOMMENDED OUTPUT CURRENT = 1.8V = 2.5V = 3.3V INPUT VOLTAGE (V) T A = +85 C T A = +7 C MAXIMUM INPUT VOLTAGE fig3 Figure 2. Adjustable Output Using External Feedback Resistors Figure 3. Power Operating Regions: Maximum Output vs. Supply Voltage POK Output The power OK (POK) output pulls low when OUT is less than 93% of the nominal regulation voltage. Once OUT exceeds 93% of the nominal voltage, POK goes high impedance. POK is an open-drain N-channel output. To obtain a voltage output, connect a pullup resistor from POK to OUT. A 1kΩ resistor works well for most applications. POK can be used as a power-okay (POK) signal to a microcontroller (µc), or drive an external LED to indicate power failure. When the is shut down, POK is held low independent of the output voltage. If unused, leave POK grounded or unconnected. Current Limit The monitors and controls the pass transistor s gate voltage, limiting the output current to.8a (typ). This current limit doubles when the output voltage is within 4% of the nominal value to improve performance with large load transients. Thermal Overload Protection Thermal overload protection limits total power dissipation in the. When the junction temperature exceeds T J = +17 C, a thermal sensor turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the junction temperature cools by 2 C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection protects the in the event of fault conditions. For continuous operation, do not exceed the absolute maximum junction-temperature rating of T J = +15 C. Operating Region and Power Dissipation The s maximum power dissipation depends on the thermal resistance of the IC package and circuit board, the temperature difference between the die junction and ambient air, and the rate of air flow. The power dissipated in the device is P = I OUT (V IN - ). The maximum allowed power dissipation is 8mW at T A = +7 C or: P MAX = (T J(MAX) - T A ) / ( θ JC + θ CA ) where T J - T A is the temperature difference between the die junction and the surrounding air, θ JC is the thermal resistance of the junction to the case, and θ CA is the thermal resistance from the case through the PC board, copper traces, and other materials to the surrounding air. For best heatsinking, the copper area should be equally shared between the IN, OUT, and GND pins. The delivers up to.5a RMS and operates with input voltages up to +5.5V, but not simultaneously. High output currents can only be sustained when inputoutput differential voltages are low, as shown in Figure 3. 7
8 5mA Low-Dropout Applications Information Capacitor Selection and Regulator Stability Capacitors are required at the s input and output for stable operation over the full temperature range and with load currents up to 5mA. Connect a 1µF capacitor between IN and ground and a 3.3µF low- ESR capacitor between OUT and ground. For output voltages less than 2V, use a 4.7µF low-esr output capacitor. The input capacitor (C IN ) lowers the source impedance of the input supply. Reduce noise and improve load-transient response, stability, and powersupply rejection by using larger output capacitors, such as 1µF. The output capacitor s (C OUT ) equivalent series resistance (ESR) affects stability and output noise. Use output capacitors with an ESR of.1ω or less to ensure stability and optimum transient response. Surfacemount ceramic capacitors have very low ESR and are commonly available in values up to 1µF. Connect C IN and C OUT as close to the as possible to minimize the impact of PC board trace inductance. Noise, PSRR, and Transient Response The is designed to operate with low dropout voltages and low quiescent currents in battery-powered systems while still maintaining good noise, transient response, and AC rejection. See the Typical Operating Characteristics for a plot of power-supply rejection ratio (PSRR) versus frequency. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The load-transient response (see Typical Operating Characteristics) shows two components of the output response: a DC shift from the output impedance due to the load current change, and the transient response. A typical transient response for a step change in the load current from 1mA to 5mA is 8mV. Increasing the output capacitor s value and decreasing the ESR attenuates the overshoot. Input-Output (Dropout) Voltage A regulator s minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-tosource on-resistance (R DS(ON) ) multiplied by the load current (see Typical Operating Characteristics). V DROPOUT = V IN - = R DS(ON) I OUT The ground current remains below 15µA in dropout. TRANSISTOR COUNT: 845 Chip Information 8
9 5mA Low-Dropout Package Information 6LSOT.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 12 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
10 ENGLISH?????????? WHAT'S NEW PRODUCTS SOLUTIONS DESIGN APPNOTES SUPPORT BUY COMPANY MEMBERS Part Number Table Notes: See the QuickView Data Sheet for further information on this product family or download the full data sheet (PDF, 268kB). Other options and links for purchasing parts are listed at: Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: See full data sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Part Number Free Sample Buy Direct Package: TYPE PINS SIZE DRAWING CODE/VAR * Temp RoHS/Lead-Free? EUT25#G16 EUT15#TG16 EUT18#TG16 EUT2#TG16 EUT25#TG16 EUT33#TG16 EUT5#TG16-4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes
11 EUT15#G16 EUT5#G16 EUT33#G16 EUT2#G16 EUT5 EUT33 EUT25 EUT2 EUT18 EUT15 EUT18-T EUT2-T EUT25-T EUT33-T EUT5-T EUT18-TG16-4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes -4C to +85C RoHS/Lead-Free: Yes
12 EUT15-T Didn't Find What You Need? CONTACT US: SEND US AN C opyright 27 by Maxim Integrated Products, Dallas Semiconductor Legal Notices P rivacy P olicy
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